Re: [Qtractor-devel] Regressions in current drumkv1 Git

[Frank N. <bea...@we...>]

Hi again,

a few days ago I wrote:

> > as of drumkv1-0.9.2.34git.56c7f4 today those issues might have been
> > fixed for you to bother again :)
> 
> Great, thanks..I gave it a quick try yesterday and was still able to provoke
> a crash after some time of fiddling around, but I have no core dump, so will
> need to go after this again this weekend.

I have run some more tests today, and can still get qtractor/drumkv1 to crash pretty
quickly; the point where it's crashing is not constant, though.

Now I realized I do not have to run the drumkv1 LV2 plugin in Qtractor; I can also
make the stand-alone "drumkv1_jack" app to crash in a similar way, and I guess
this might make debugging easier.
Also, I don't need to connect any JACK audio ports of drumkv1_jack to my soundcard
to provoke the crash. It's enough to connect MIDI, play MIDI events into drumkv1_jack
via a keyboard while I am quickly switching the sound bank for a little while
(Cursor-Up/Down in the "Recently used" dropdown box helps to reproduce this quickly).


Here are some excerpts from inspecting the core dump of a crashed drumkv1_jack instance:

Core was generated by `drumkv1_jack'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f8b57f46924 in drumkv1_sample::ratio (this=0x0) at drumkv1_sample.h:113
113                     { return m_ratio; }
[Current thread is 1 (Thread 0x7f8b3cbea700 (LWP 8061))]
(gdb) bt
#0  0x00007f8b57f46924 in drumkv1_sample::ratio (this=0x0) at drumkv1_sample.h:113
#1  0x00007f8b57f46a4a in drumkv1_generator::next (this=0x18eb5d8, freq=65.4063873) at drumkv1_sample.h:193
#2  0x00007f8b57f44167 in drumkv1_impl::process (this=0x18b8cc0, ins=0x7f8b3cbe9850, outs=0x7f8b3cbe9830, nframes=128) at drumkv1.cpp:2078
#3  0x00007f8b57f45a7a in drumkv1::process (this=0x18b18d0, ins=0x7f8b3cbe9850, outs=0x7f8b3cbe9830, nframes=128) at drumkv1.cpp:2502
#4  0x000000000040a8bd in drumkv1_jack::process (this=0x18b18d0, nframes=128) at drumkv1_jack.cpp:276
#5  0x0000000000409f7a in drumkv1_jack_process (nframes=128, arg=0x18b18d0) at drumkv1_jack.cpp:112
#6  0x00007f8b58693c1e in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#7  0x00007f8b58693058 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#8  0x00007f8b586ab680 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#9  0x00007f8b56ef06ba in start_thread (arg=0x7f8b3cbea700) at pthread_create.c:333
#10 0x00007f8b5668e41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109


Core was generated by `drumkv1_jack'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f3c6a223961 in drumkv1_sample::isOver (this=0x0, index=0) at drumkv1_sample.h:128
128                     { return !m_pframes || (index >= m_offset_end2); }
[Current thread is 1 (Thread 0x7f3c4eebf700 (LWP 8196))]
(gdb) bt
#0  0x00007f3c6a223961 in drumkv1_sample::isOver (this=0x0, index=0) at drumkv1_sample.h:128
#1  0x00007f3c6a223c6c in drumkv1_generator::isOver (this=0x98f8d8) at drumkv1_sample.h:224
#2  0x00007f3c6a223aee in drumkv1_generator::value (this=0x98f8d8, k=0) at drumkv1_sample.h:203
#3  0x00007f3c6a22119f in drumkv1_impl::process (this=0x962c70, ins=0x7f3c4eebe850, outs=0x7f3c4eebe830, nframes=128) at drumkv1.cpp:2081
#4  0x00007f3c6a222a7a in drumkv1::process (this=0x95dc10, ins=0x7f3c4eebe850, outs=0x7f3c4eebe830, nframes=128) at drumkv1.cpp:2502
#5  0x000000000040a8bd in drumkv1_jack::process (this=0x95dc10, nframes=128) at drumkv1_jack.cpp:276
#6  0x0000000000409f7a in drumkv1_jack_process (nframes=128, arg=0x95dc10) at drumkv1_jack.cpp:112
#7  0x00007f3c6a970c1e in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#8  0x00007f3c6a970058 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#9  0x00007f3c6a988680 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#10 0x00007f3c691cd6ba in start_thread (arg=0x7f3c4eebf700) at pthread_create.c:333
#11 0x00007f3c6896b41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109


Core was generated by `drumkv1_jack'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fee4cb9bb2c in drumkv1_generator::value (this=0x27bee98, k=0) at drumkv1_sample.h:208
208                     const float x0 = frames[m_index];
[Current thread is 1 (Thread 0x7fee31834700 (LWP 8249))]
(gdb) bt
#0  0x00007fee4cb9bb2c in drumkv1_generator::value (this=0x27bee98, k=0) at drumkv1_sample.h:208
#1  0x00007fee4cb9919f in drumkv1_impl::process (this=0x278dc40, ins=0x7fee31833850, outs=0x7fee31833830, nframes=128) at drumkv1.cpp:2081
#2  0x00007fee4cb9aa7a in drumkv1::process (this=0x2788d00, ins=0x7fee31833850, outs=0x7fee31833830, nframes=128) at drumkv1.cpp:2502
#3  0x000000000040a8bd in drumkv1_jack::process (this=0x2788d00, nframes=128) at drumkv1_jack.cpp:276
#4  0x0000000000409f7a in drumkv1_jack_process (nframes=128, arg=0x2788d00) at drumkv1_jack.cpp:112
#5  0x00007fee4d2e8c1e in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#6  0x00007fee4d2e8058 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#7  0x00007fee4d300680 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#8  0x00007fee4bb456ba in start_thread (arg=0x7fee31834700) at pthread_create.c:333
#9  0x00007fee4b2e341d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109



Anything else how I can help in digging deeper? Do you need my test data (tiny drum pattern track)?
I'd love to see this one squashed, https://sonoj.org is just around the corner ;-).

Thanks,
Frank